code: def test_extend(self, container: MetadataContainer, series_type: str):
      with self.run_then_assert(container, series_type) as (
          namespace,
          values,
          steps,
          timestamps,
      ):
          namespace.extend(
              [values[0]], steps=[steps[0]], timestamps=[timestamps[0]]
          )
          namespace.extend(
              values[1:], steps=steps[1:], timestamps=timestamps[1:]
          )
  
file_path: neptune-client/tests/e2e/standard/test_series.py
imports: import random
  import time
  from contextlib import contextmanager
  import pytest
  from PIL import Image
  from neptune.metadata_containers import MetadataContainer
  from neptune.types import FileSeries, FloatSeries, StringSeries
  from tests.e2e.base import AVAILABLE_CONTAINERS, BaseE2ETest, fake
  from tests.e2e.utils import generate_image, image_to_png, tmp_context
label_desc: Use image node_id 3 for calling the TestSeries obj's underlying member method code with example usage: obj.test_extend(container, series_type) without return types